Not with Type 1 on any material. Marginal with Type 2 on constrained
substrates.
Dewey
> -----Original Message-----
> From: Edwin Louis [SMTP:[log in to unmask]]
> Sent: Thursday, March 18, 2004 2:35 PM
> To: [log in to unmask]
> Subject: Re: [TN] TSOPs
>
> Is anyone getting reliability with Alloy 42 leaded TSOPs on Thurmount PWBs
> and if so what are the drawbacks?
>
> -----Original Message-----
> From: Bev Christian [mailto:[log in to unmask]]
> Sent: Thursday, March 18, 2004 9:01 AM
> To: [log in to unmask]
> Subject: Re: [TN] TSOPs
>
>
> Royce,
> I realize why you do that from a PROCESS point of view, but Edwin, Werner
> and I were talking in terms of RELIABILITY.
> Bev
>
> -----Original Message-----
> From: Taylor, Royce [mailto:[log in to unmask]]
> Sent: March 18, 2004 8:55 AM
> To: [log in to unmask]
> Subject: Re: [TN] TSOPs
>
>
> We have one customer that has more than one assembly with TSOPS utilizing
> alloy 42 (TI parts I believe). For these assemblies I run my Peak relow
> temps higher than I normally do (220-230 C.) with good results.
>
> Royce
> *************************************************************************
> Royce Taylor
> Process Engineering/Production
> Suntron Corporation NEO
> 104 Glenn Street
> Lawrence, MA 01843
> (978)747-2061 voice
> (978)747-2010 fax
> [log in to unmask]
>
>
>
> -----Original Message-----
> From: Bev Christian [mailto:[log in to unmask]]
> Sent: Thursday, March 18, 2004 8:25 AM
> To: [log in to unmask]
> Subject: Re: [TN] TSOPs
>
>
> Edwin,
> Good for you for using the archives! Short answer: yes, rejected!
> Bev Christian
> Research in Motion
>
> -----Original Message-----
> From: Edwin Louis [mailto:[log in to unmask]]
> Sent: March 18, 2004 8:21 AM
> To: [log in to unmask]
> Subject: Re: [TN] TSOPs
>
>
> I notice in the IPC Archives that all of the questions and comments about
> alloy 42 were in the
> ~1994-1995 time period. Has the general population out there totally
> rejected TSOPS
> with alloy 42 leads? No comments or questions appear from 2001 to present.
>
> -----Original Message-----
> From: Werner Engelmaier [mailto:[log in to unmask]]
> Sent: Tuesday, March 16, 2004 6:43 AM
> To: [log in to unmask]
> Subject: Re: [TN] TSOPs
>
>
> Hi Edwin,
> >Are there any specifications ,standards or articles on soldering TSOPs
> >especially ones with Alloy42 leads?
> There are some papers:
> Engelmaier, W., "Alloy 42--Not a Choice Material for Surface Mount Leads,"
>
> 35th Annual IPC Meeting, Bal Harbour, FL, April 1992.
> Engelmaier, W., and B. Fuentes, "Alloy 42: A Material to be Avoided for
> Surface Mount Solder Component Leads and Lead Frames," Proc. Surface Mount
>
> International Conf., San Jose, CA, August-September 1994, pp. 644-655;
> also
> in Proc.
> Int. Electronics Packaging Conf. (IEPS), Atlanta, September 1994, pp.
> 503-516;
> also in Proc. 19th Ann. Electronics Manufacturing Sem., Naval Air Warfare
> Center, China Lake, CA, February 1995, pp. 5-20; also in Proc. NEPCON West
> '95,
> Anaheim, CA, February-March 1995, pp. 385-395; also in Soldering & Surface
> Mount
> Technology, No. 21, October 1995, pp. 20-25.
>
> Regards,
> Werner Engelmaier
> Engelmaier Associates, L.C.
> Electronic Packaging, Interconnection and Reliability Consulting
> 7 Jasmine Run
> Ormond Beach, FL 32174 USA
> Phone: 386-437-8747, Fax: 386-437-8737
> E-mail: [log in to unmask], Website: www.engelmaier.com
>
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